package com.itheima.filter;

import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;

import java.io.IOException;
@Slf4j
//@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req=(HttpServletRequest) servletRequest;
        HttpServletResponse resp=(HttpServletResponse) servletResponse;
        //1.获取请求url
        String url = req.getRequestURL().toString();
        log.info("url:{}",url);
        //2.判定请求url是否包含login，如果包含，放行
        if(url.contains("login")){
            log.info("登录操作，放行......");
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
        //3.获取请求头的令牌token
        String jwt = req.getHeader("token");
        //4.判定令牌是否存在，如果不存在，返回错误结果
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转化 对象--json-------->阿里巴巴fastjson
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }
        //5.解析token，如果失败，返回错误结果
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {//jwt解析失败
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录信息");
            //手动转化 对象--json-------->阿里巴巴fastjson
            Result error = Result.error("NOT_LOGIN");
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }
        //6.放行
        log.info("令牌合法，放行");
        filterChain.doFilter(servletRequest,servletResponse);
    }


}
